Rated 5 out of 5 stars
This is to add balance to my earlier review. CookieKeeper is an outstanding add-on. It covers conventional and LSO cookies and in this it is, as far as I know, unique. I find it invaluable.
Unfortunately it has not been updated for Firefox versions later than 49.0, but as noted earlier, it does work in Firefox 54.0 save for one annoying bug.